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The elements which lie between s and p block elements in the long form periodic table are called as:

The de Broglie wavelength of a tennis ball of mass 30 g moving with a velocity of $\text{20}m/s$ is approximately: $\text{(Planck's constant,}h=6.63\times {10}^{-34}Js)$

On the addition of 1 ml. of 10% solution of sodium chloride to 10 ml. of gold sol in presence of 0.025 g of starch, the coagulation is just prevented. The gold number of starch is

The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reaction is:

A German physicist gave a principle about the uncertainities in simultaneous measurement of position and momentum of small particles. According to the physicist:

It is impossible to measure simultaneously the position and momentum of small particle with absolute accuracy or certainty. If an attempt is made to measure any of these two quantities with higher accuracy, the other becomes less accurate. The product of the uncertainty in position $\left(\Delta x\right)$ and uncertainty in position $\left(\Delta p\right)$ is always constant and is eual to or greater than $\frac{h}{4\pi }$, where $h$ is Plank's constant i.e. $\left(\Delta x\right)\left(\Delta p\right)\ge \frac{h}{4\pi }$.



Uncetainty in postion is twice the uncertainty in momentum, uncertainty in velocity is:

"The relative lowering of the vapour pressure is equal to the mole fraction of the solute.” This law is called:

For the given reaction :
$C_2{H}_4+C{l}_2\to C_2{H}_{4}C{l}_2$
$△H=-270.6kJmo{l}^{-1}△S=-139J{K}^{-1}mo{l}^{-1}$
Find $△G$ in $kJ/mol$ if $T=300K$?

Total number of radial nodes present in $3s$ and $2p$ respectively, are:

The vacant space in a BCC lattice unit cell is :

A 10 ml sample of hydroxylamine (NH2OH) aqueous solution is diluted to 50 ml. This diluted solution was completely reacted with 0.01 moles of Fe3+ ions as per following reaction : 2NH2OH+ 4Fe + →N2O +H2O + 4Fe2+ + 4H+ If molarity of original hydroxylamine solution is x, find the value of 100x.

Which of the following has the smallest heat of hydrogenation per mole?

Match the correct pairs.

Which of the following compounds has the highest boiling point ?

The vapour density of a mixture of $N{O}_2$ and $N_2{O}_4$ at ${27}^{\circ }\text{C}$ is 38.3. How many moles of $N{O}_2$ will be present in $500\text{g}$ of the mixture?

Masses of two particles having same kinetic energies are in the ratio 1 : 2 then, their de-broglie wavelengths are in ratio:

The angular speed of the electron in the nth orbit of Bohr’s hydrogen atom is:

Increasing order of reactivity of $C{H}_{3}CHO,C{H}_{3}CO{C}_2{H}_5\text{and}C{H}_{3}COC{H}_3$ towards nucleophilic addition is:

Which of the following represents the correct order of increasing negative electron gain enthalpy for elements $O,FandCl$?

The organic compound that gives following qualitative analysis is:

A mixture of boron trichloride and hydrogen is subjected to silent electric discharge to form ‘A’ and HCl. ‘A’ is mixed with $N{H}_3$ and heated to ${200}^{\circ }C$ to form ‘B’. The formula of ‘B’ is

For the isoelectronic species of $N^{3-},O^{2-}$ and $F^{-}$ the ionic radii $\left(\stackrel{\circ }{A}\right)$ are respectively

Q17) The discovery that neutrinos switch between different "flavours" has won the 2015 Nobel Prize in physics. ‘Neutrino Oscillations’ is-

How does the presence of double bonds in rubber molecules influence their structure and reactivity ?

Which one of the following structures has the IUPAC name $\text{3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic}$ acid?

Two Isomeric alkenes A and B having molecular formula, $C_5{H}_{9}Cl$ on adding $H_2$, A gives optically inactive compound while B gives a chiral compound. The two isomer are